Try a Rentacenter or Rentway type place. We did that in the early 90's before we got a video camera of our own and it cost us like $20 for a week. You don't have to actually "rent to own" - you're free to return it whenever you want (they actually make more money that way) We used those places all the time to rent furniture for a concert festival - I'd have to go over and cut a deal to furnish all the trailers backstage. They'd bring it all out and pick it up a week later. From talking to them I found out people rent short term ALL the time.
I know when Disney DID rent them out, it was still so much cheaper to do it this way.